循环预剪作用对饱和粉土抗液化强度和孔压发展的影响
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摘要
利用DDS-70微机控制电磁式振动三轴仪,在均等固结条件下,对黄河口饱和粉土进行了不同预剪应力和预剪振次的循环三轴试验,探讨了循环预剪作用对饱和粉土的抗液化强度和孔隙水压力发展规律的影响.试验结果表明:低水平的循环预剪应力不会使饱和粉土在循环预剪阶段破坏;随着循环预剪应力和循环预剪振次的增加,饱和粉土的抗液化强度得到提高,但当循环预剪振次达到某一值时,抗液化强度趋于稳定.对振动孔隙水压力比-振次比进行归一化后发现:无循环预剪作用时饱和粉土孔压发展模式为双曲线,有循环预剪作用时为反正弦曲线,反正弦曲线拟合参数较小,约为0.2～0.4.
Under the conditions of different cyclic preshearing stress and cyclic preshearing vibration times,cyclic triaxial tests on saturated silt of Yellow River estuary were conducted by DDS-70 microcomputer control electromagnetic vibration triaxial apparatus to study the liquefaction resistance and dynamic pore water pressure of saturated silt.The results show that the saturated silt is not failed under low cyclic preshearing stress in cyclic preshearing stage.The liquefaction resistance of saturated silt is increased with the increase of cyclic preshearing stress and cyclic preshearing vibration times.The liquefaction resistance reaches a stable value after a certain vibration times.Normalized relationship between vibration cycles and pore water pressure can be fitted by hyperbola and arcsine functions.The mode of pore water pressure is hyperbola without cyclic preshearing,while with it,the mode is arcsine with small fitting parameter of 0.2 to 0.4.
Under the conditions of different cyclic preshearing stress and cyclic preshearing vibration times,cyclic triaxial tests on saturated silt of Yellow River estuary were conducted by DDS-70 microcomputer control electromagnetic vibration triaxial apparatus to study the liquefaction resistance and dynamic pore water pressure of saturated silt.The results show that the saturated silt is not failed under low cyclic preshearing stress in cyclic preshearing stage.The liquefaction resistance of saturated silt is increased with the increase of cyclic preshearing stress and cyclic preshearing vibration times.The liquefaction resistance reaches a stable value after a certain vibration times.Normalized relationship between vibration cycles and pore water pressure can be fitted by hyperbola and arcsine functions.The mode of pore water pressure is hyperbola without cyclic preshearing,while with it,the mode is arcsine with small fitting parameter of 0.2 to 0.4.
引文
[1]Finn W D L,Bransby P L,Pickering D J.Effect ofstrain history on liquefaction of sand[J].Journal of theSoil Mechanics and Foundations Division,1970,96(6):1917-1934.
[2]Ishihar A K,Okada S.Effect of stress history on cyclicbehavior of sand[J].Soil and Foundation,1978,18(4):31.
[3]Oda M,Kawamoto K,Suzuki K.Microstructural inter-pretation on reliquefaction of saturated granular soils un-der cyclic loading[J].Journal of Geotechnical and Geo-environmental Engineering,2001,127(5):416-423.
[4]张振东.预剪对饱和松砂剪切特性的影响及亚塑性边界面本构模型改进[D].大连:大连理工大学土木工程学院,2008.
[5]苏栋,李相崧.地震历史对砂土抗液化性能影响的试验研究[J].岩土力学,2006,27(10):1815-1818.Su Dong,Li Xiangsong.Centrifuge investigation on effectof seismic history on resistance of sand to liquefaction[J].Rock and Soil Mechanics,2006,27(10):1815-1818.(in Chinese)
[6]曹宇春,王天龙.上海粉土液化特性及孔压模型的试验研究[J].上海地质,1998(3):60-64.Cao Yuchun,Wang Tianlong.Experimental study onliquefaction behavior and pore pressure model of silt inShanghai[J].Shanghai Geology,1998(3):60-64.(inChinese)
[7]曾长女,刘汉龙,丰土根,等.饱和粉土孔隙水压力性状试验研究[J].岩土力学,2005,26(12):1963-1966.Zeng Changnü,Liu Hanlong,Feng Tugen,et al.Teststudy on pore water pressure mode of saturated silt[J].Rock and Soil Mechanics,2005,26(12):1963-1966.(in Chinese)
[8]张健,高玉峰,沈扬,等.波浪荷载作用下饱和粉土反正弦孔压拟合参数影响因素分析[J].岩土力学,2011,32(3):727-732.Zhang Jian,Gao Yufeng,Shen Yang,et al.Factor ana-lysis of fitting parameter for saturated silt arcsin pore wa-ter pressure under wave loading[J].Rock and Soil Me-chanics,2011,32(3):727-732.(in Chinese)
[9]吴世明.土动力学[M].北京:中国建筑工业出版社,2000:250-256.
[10]Georgiannou V N,Tsomokos A,Stavrou K.Monotonicand cyclic behavior of sand under torsional loading[J].Geotechnique,2008,58(2):113-124.
[11]Seed H B,Lysmer J,Martin P P.Pore-water pressurechanges during soil liquefaction[J].Journal of Geotech-nical Engineering Division,1976,102(4):323-346.
[2]Ishihar A K,Okada S.Effect of stress history on cyclicbehavior of sand[J].Soil and Foundation,1978,18(4):31.
[3]Oda M,Kawamoto K,Suzuki K.Microstructural inter-pretation on reliquefaction of saturated granular soils un-der cyclic loading[J].Journal of Geotechnical and Geo-environmental Engineering,2001,127(5):416-423.
[4]张振东.预剪对饱和松砂剪切特性的影响及亚塑性边界面本构模型改进[D].大连:大连理工大学土木工程学院,2008.
[5]苏栋,李相崧.地震历史对砂土抗液化性能影响的试验研究[J].岩土力学,2006,27(10):1815-1818.Su Dong,Li Xiangsong.Centrifuge investigation on effectof seismic history on resistance of sand to liquefaction[J].Rock and Soil Mechanics,2006,27(10):1815-1818.(in Chinese)
[6]曹宇春,王天龙.上海粉土液化特性及孔压模型的试验研究[J].上海地质,1998(3):60-64.Cao Yuchun,Wang Tianlong.Experimental study onliquefaction behavior and pore pressure model of silt inShanghai[J].Shanghai Geology,1998(3):60-64.(inChinese)
[7]曾长女,刘汉龙,丰土根,等.饱和粉土孔隙水压力性状试验研究[J].岩土力学,2005,26(12):1963-1966.Zeng Changnü,Liu Hanlong,Feng Tugen,et al.Teststudy on pore water pressure mode of saturated silt[J].Rock and Soil Mechanics,2005,26(12):1963-1966.(in Chinese)
[8]张健,高玉峰,沈扬,等.波浪荷载作用下饱和粉土反正弦孔压拟合参数影响因素分析[J].岩土力学,2011,32(3):727-732.Zhang Jian,Gao Yufeng,Shen Yang,et al.Factor ana-lysis of fitting parameter for saturated silt arcsin pore wa-ter pressure under wave loading[J].Rock and Soil Me-chanics,2011,32(3):727-732.(in Chinese)
[9]吴世明.土动力学[M].北京:中国建筑工业出版社,2000:250-256.
[10]Georgiannou V N,Tsomokos A,Stavrou K.Monotonicand cyclic behavior of sand under torsional loading[J].Geotechnique,2008,58(2):113-124.
[11]Seed H B,Lysmer J,Martin P P.Pore-water pressurechanges during soil liquefaction[J].Journal of Geotech-nical Engineering Division,1976,102(4):323-346.
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